3D FEA-based design of an iron-assisted quasi-Halbach segmented PM T-LSM

The paper is devoted to a 3D finite element analysis (FEA)-based design and feature investigation of tubular-linear synchronous machines (T-LSMs) equipped with iron-assisted mover with segmented quasi-Halbach magnetized permanent magnets (PMs). The mover design-sizing procedure is initiated by an investigation of the influences of the width and the height of the iron rings, on the maximum value of the phase flux linkages and the peak-to-peak cogging force. This enables the selection of a set of parameters achieving a high phase flux linkage with reduced cogging force. In order to highlight the effectiveness of the proposed concept, its comparison with the case of an ironless mover its carried out, with emphasis on the no-load features. A 50% increase of the amplitude of the fundamental back-EMF is gained thanks to the included iron rings in the mover.